Frustration with vein selection training

Does anyone else get annoyed when trainees overlook basic escalation cues? I just had a session where people kept missing obvious signs, and it felt like we wasted time reiterating the fundamentals. I really wish we could emphasize those cues better.

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌⁠​​‌‍‍​‌‍‍‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠‌‌⁠⁠‌⁠‌​‌‍⁠⁠‌⁠​​‌‍‍‌‌‍​⁠​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠​‍​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‌‍​⁠​‍​⁠‍‌​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍‌‌‍​​⁠‌⁠‌​⁠‍‌‍‌​‌⁠​‍‌⁠‍‍‌‍‍‍‌‍‌⁠‌⁠‌‌​⁠‌‍‌‌‍​‌⁠‌​‌​‍⁠‌​​‌‌​⁠​​⁠‌‌​‍​‍‌⁠⁠‌​